/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionStrata.h
class UMaterialExpressionStrataTransmittanceToMFP : public [UMaterialExpressionStrataUtilityBase](API\Runtime\Engine\Materials\UMaterialExpressionStrataUtility-)
FExpressionInpu...
Thickness
The desired thickness in centimeter.
FExpressionInpu...
TransmittanceColor
The colored transmittance for a view perpendicular to the surface.